Does having additional siping added to a tire decrease it's tread life / void a manufacturers warranty?

I'm guessing it would void a warranty but not sure whether it would decrease tread life.

I'm getting very close to pulling the trigger on a set of Toyo Open Country M/T tires..... they look to have a little bit of siping (one sipe per lug it looks like), but in addition to mud and snow, I run into a fair amount of ice up where i'm from. I've never had after market siping added to tires before, thought this might be the tie to investigate.

I looked into siping a set of Hankook MT's for the same reason. Siping greatly increases ice and snow traction and extends the life of the tread. There are many documented resources that prove siping is a good thing - if done right.

Sipe too close to the carcass and you can risk serious tire / vehicle damage. Typically the outer lugs of the mud tires are not siped due to chunking of the tread block - however if you dont rock crawl - you probably wont have this problem.

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